<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item, index) in goods" class="menu-item" :class="{'current': currentIndex===index}" @click.prevent="selectMenu(index)">
          <span class="text border-1px">
            <icons v-show="item.type>0" :size="3" :type="item.type"></icons>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="goods-wrapper" ref="goodsWrapper">
      <ul>
        <li class="good-list good-list-hook" v-for="item in goods">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li @click.stop.prevent="selectGood(food)" class="good-item" v-for="food in item.foods">
              <div class="icon">
                <img :src="food.icon" width="57" height="57" alt="">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol @add="addFood" :good="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <cart ref="shopcart" :selectGoods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></cart>
    <goodDetail ref="goodDetail" @add="addFood" :good="selectedGood"></goodDetail>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import icons from '@/components/icons/icons';
  import cart from '@/components/cart/cart';
  import cartcontrol from '@/components/cartcontrol/cartcontrol';
  import goodDetail from '@/components/good-detail/good-detail';

  const ERR_OK = 0;

  export default {
    props: {
      seller: {
        type: Object
      }
    },
    data() {
      return {
        goods: [],
        heightArr: [],
        scrollY: 0,
        selectedGood: {}
      };
    },
    computed: {
      currentIndex() {
        let arr = this.heightArr;
        for (let i = 0; i < arr.length; i++) {
          let h = arr[i];
          let next = arr[i + 1];
          if (!next || (this.scrollY >= h && this.scrollY < next)) {
            return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food);
            }
          });
        });
        return foods;
      }
    },
    created() {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];

      this.axios.get('/api/goods').then((response) => {
        response = response.data;
        if (response.errno === ERR_OK) {
          this.goods = response.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calcHeight();
          });
        }
      });
    },
    methods: {
      selectMenu(index) {
        let goodsList = this.$refs.goodsWrapper.getElementsByClassName('good-list-hook');
        let el = goodsList[index];
        this.goodsScroll.scrollToElement(el, 300);
      },
      selectGood(good) {
        this.selectedGood = good;
        this.$refs.goodDetail.show();
      },
      addFood(target) {
        this._drop(target);
      },
      _drop(target) {
        // 优化体验，异步执行小球下落动画
        this.$nextTick(() => {
          this.$refs.shopcart.drop(target);
        });
      },
      _initScroll() {
        this.menuScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });
        this.goodsScroll = new BScroll(this.$refs.goodsWrapper, {
          click: true,
          probeType: 3
        });

        this.goodsScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y));
        });
      },
      _calcHeight() {
        let goodList = this.$refs.goodsWrapper.getElementsByClassName('good-list-hook');
        let height = 0;
        this.heightArr.push(height);
        for (let i = 0; i < goodList.length; i++) {
          let item = goodList[i];
          height += item.clientHeight;
          this.heightArr.push(height);
        }
      }
    },
    components: {
      icons, cart, cartcontrol, goodDetail
    }
  };
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin";

  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        line-height: 14px
        padding: 0 12px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          font-size: 12px
          border-1px(rgba(7, 17, 27, 0.1))
    .goods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        font-size: 12px
        font-weight: 700
        color: #666
        background: #f1f1f1
      .good-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            font-weight: 700
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            margin-bottom: 8px
            line-height: 12px
          .extra
            .count
              margin-right: 12px
          .price
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              font-weight: 700
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0px
            bottom: 12px
</style>
